“She’s so well-known in terms of what she looks like and what she sounds like and how she moves, so to get that is definitely daunting,” Portman recently told Entertainment Weekly.

“[We see] the toughness of who she was, dealing with what she had to go through while keeping herself together for the sake of the country and her family, and also the vulnerability and the intelligence of how she really crafted [J.F.K.’s] legacy,” she added.

Jackie premiered at the Venice Film Festival in September and will open in theaters Dec. 2.